Apparatus for forming sand molds for pipes



(No Model.) 2 Sheets-Sheet 1` P. H. SHARP.

APPARATUS FOR FORMING SAND MoLDs FOR PIPES, am. NoI 475,349. Patented May 24, 1892.

Ffa 1.' e f INVENTOR WITNESSES (No Model.) 2 Sheets- Sheet 2.l

P. H.' SHARP. 1 APPARATUS FOR FORMING SAND AMOLDS FOR PIPES, 6m.

No. 475,349. Patented May 24, 1892.

ANVENTORZ Wi-54M# FIG. 3.

D/L/LA o., msnmnran n c .UNi'TED STATES PATENT OFFICE.

PHILIP H. SHARP, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR FORIVIING SAND MOLDS FOR PIPES, 80C.

SPECIFICATION forming part of Letters Patent No. 475,349, dated May 24, 1892.

Serial No. 391,088. (No model.)

To all whom/it may concern.-

Be it known that I, PHILIP H. SHARP, a citizen of the United States, residing at Philadelphia, in the county'of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Apparatus for Forming Sand Molds for Pipes and Cylindric Castings; and I do hereby declare the following to be a sufficiently full, clear, and exact description thereof as to enable others skilled in the art to make and use the said invention.

This invention relates to the making of sand molds for casting pipes and similar cylindric metallic forms, and has for its objects the more expeditious preparation and greater perfection of such work; andit consists of the mechanism hereinafter described, and shown in the accompanying drawings.

Figure 1 is a transverse section of a pit with side elevation of my apparatus in operation, one-half of the iiask being removed, showing said sand mold partly made. Fig. 2 is a plan view of the same with machine turned away from the flask; Fig. 3, an enlarged view showing the internal arrangement of the packer and connections; Fig. 4, a perspective plan of the packer. Figs. 5, 6, and 7 are respectively elevation, sectional plan, and vertical section of details shown in Fig. 3. Figs. 8, 9, and 10 are respectively plan and section and side elevation of the splitbell pattern used in conjunction with my apparatus. Fig. 11 shows an alternative arrangement in view of the split bell.

d., Fig. l, is a stand-bracket resting on the pit-floor and by preference secured in a fixed position. Connected to its upper surface is a seat a2, planed to receive the dask b (onehalf only shown) in a vertical position, and is centrally bored out to permit the passage of a pattern c, as also furnished with the customary bead-ring a3, used on the tamp-seat for pipes, cast with the bell uppermost. Near the bottom of the bracket is a step a', made true with the hole above it and squared to receive the lower end of a screwed stationary shaft d, extending upward concentrically with the flask through a bearing d2 on the 5o projecting end of the jib e, placed in true vertical line with the step a. This shaft is encircled by the tubular shaft f, fitted with feathers f f', as shown, its upper end passing through the tube-bearing and gear-wheel g, and its lower end connected to the packer h, carrying ridge-blade h. The winch-handle or pulley (shown in dotted line) imparts rotary motion through the shaft li to the gear- Wheel 112, and so through the gear g and the feathers f f to the tubef and packer h.

Referring to Fig. 3, it will be seen that the packer h is secured to the tube f by set-screws through the internal hub, the tube projecting through the hub on the pat-tern c and having a collar f2 secured to its lower end, the pattern-hub riding upon its upper surface.

Letter K, Fig. 3, shows a split nut in side elevation, grasping the screw-shaft d. (Seen in plan view, Fig. 6, in front elevation, Fig. 5, and vertical section, Fig. 7.) The nut K has its fulcrum on the stud Z tapped into the collar f2, and when closed is fastened bythe strap K', as seen in Fig. 5. This strap, pendent from a fulcrum K2, is slipped over projections K3, formed on each haltl of the split nut, as shown.

M shows a collar placed beneath the split nut K and secured to the shaft d.

The jib e is adapted to rotate around a fixed stud e on a connected bearing on the foundation-plate e2, as clearly shown in Fig. l.

Figs. S, 9, and 10 show plan, section, and side elevation, respectively, of a split-bell pattern n, the two halves capable of being locked together by means of the L-headed bars n n', pivoted internally, as shown, one on either' half, and engaging lugs n2 n2, formed on the upper surface of either half.

The operation of the machine is as follows: Sand being thrown or poured in the iiask and rotary motion imparted to the tube f and packer 7i, the split nut It within the pattern being closed by the strap la', the tube-shaft f and packer h,with its ridge-blade h', are forced upward at the same time they are rotated by means of the nut 7c, revolving with them around the stationary screw-shaft d, the pattern c following after the packer h by reason of its resting upon the collar f2. The pattern c is supported loosely upon the collar f2 of the nut K. The pattern is not attached thereto, and

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Io-split-bell pattern ot, Figs. 8, 9, and 10, is then placed around the pattern c and the bell formed by hand in the usual manner. The packer is now drawn up until the pattern clears the bell-pattern, when the swivel-hook o is placed under the lower edge of the pattern, the nut lo opened by releasing the strap k. (See Fig. 3.) The Winch-handleris transferred to the end of the shaft p, carrying a spool p and having bearings from the jib e.

2o The chain or rope q, connected to the upper end of the screw-shaft d, passing over the sheave d to the spool p', is now wound upon the latter, elevating the screw-shaft d until it reaches its original position, being prevented from ascending too high by the collar M.

The jib may now be swung around one-fourth of a circle, carrying with it the screw-shaft, tube, packer, and appurtenances to permit the removal of the ask to the oven. (If de- 3o sired, the bell may be formed by inserting in mold a tube s, Fig. 11, carrying bell-pattern r in usual manner.) Vhere it is desired to move my apparatus from one iask to another, it may be mounted upon a truck suit- 3 5 able for the purpose, running on tracks parallel to the flasks to be prepared.

From the above description it will be noted that the stationary screw-shaft is permitted to remain in the flask during the whole 4o operation of packing the flask bymy apparatus, as well as forming the bell by hand, being shielded from sand particles by the tubeshaft above the packer and by the pattern below the same, and is only withdrawn after operations within the flask are concluded. g

It will further be noted, in reference to the spiral packerblade,a device old in itself, that the sand is compacted by reason of the difference in pitches of the screws of the sta- 5o tionary screw-shaft and that of the packerblade, as, although the latter commenced at or near the tube-shaft, it only feeds the sand into the required position for compacting,

which commences as soon as the blade passes over the cylindrical portion of the packerbody, of which .it forms a part, except when attached thereto for purposes of renewal, the blade thus encircling only a fraction of the circumference, and has a steep pitch in com- 6'0 parison with that of the stationary shaft.

Having described my invention and the operation thereof, what I claim is- 1. The flask and the stationary screw-shaft placed centrally Within the flask and extendc5 ing above and below the same, the lower end of said screw-shaft being stepped below an annular bead'- ring and its upper. end eirtending through an upper bearing, in combination with said bead-ring, a tubular shaft, a nut carried by the tubular shaft and receiving the screw-shaft, the pattern supported by said nut, and means, such as described, for rotating the tubular shaft, substantially as and for the purpose set forth.

2. The tubular shaft provided with one or more longitudinal feathers, the gear-wheel having grooves to receive the feathers, the stationary screw-shaft fitted within said tubular shaft, the packer attached to the lower end of the tubular shaft, and the ridge-blade with which the packer is provided, in combination with a loose or non-rotating patternlocated below the packer and the nut carried by the said tubular shaft to engage the screw-shaft and to support the pattern, substantially as and for the purpose set forth.

3. A split nut connected with a tubular shaft, a pattern supported by the nut, a stationary screw-shaft placed centrally within said tubular shaft, the stationary flask, and means, such as described, for rotating the said tubular shaft, substantiallyV as and for the purpose set forth.

4. A stand-bracket having an opening to receive a pattern, an annular bead-ring secured thereto, and a step for the reception of a stationary screw-shaft, in combination with said screw-shaft, the tubular shaf t, the packer attached thereto, the nut located upon said tubular shaft and carrying the pattern, and means, such as described, for rotating the tubular shaft, substantially as and for the pur- ;pose set forth. n

5. The screw-shaft, the pattern, the feathered tube-shaft encircling said screw-shaft, the nut carried by the tube-shaft and splporting the pattern, and the j ib provided @with a tubular grooved collar adapted to rotate iu a fixed bearing on the jib, substanftially as and for the purpose set forth. 6. The combination of the screw-shaft, the jib, the tube-shaft, the pattern, the nut engaging the shafts and carrying the pattern, land means for hoisting said screw and tube shafts, nut, and pattern, consisting of the chain q, the shaft p, and the spool p', located rupon the shaft p, substantially as shown and described. 7. In a pipe-inoldiug machine, the flask, ithe stationary screw-shaft, the divided nut i fitted thereto, the pattern carried by the nut, said screw-shaft beingcentrally located Within 'and extending through the upper and lower l ends of the flask, and the feathered tube-shaft engaged by the divided nut, in combination l with an upper bearing, such as described, for supporting the feathered shaft, the grooved gear-Wheel receiving the feathers of said shaft, 1 and the connected mechanism for rotating the grooved gear-wheel, substantially as and for the purpose set forth.

8. In a molding-machine, the ilask, the

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bead-ring, the pattern, the step-bearing below scribed, for rotating it, for the purpose set the pattern, the stationary screw-shaft fitted forth.'

at its lower end into said step, and the divided :nut upon which the pattern rests, the nut be- PHILIP H' SHARP ing tted on said screw-shaft and attached to Witnesses: a hollow shaft, in combination with said hol- J. DANIEL EBY, low shaft and means, substantially as de- ALEX. H. SIEGEL. 

